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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a8921a2af72a7291ccdd2c8870ff50ac21063d15b4332bf56542e4d3726ecf' 
  AND token = 'Kx9CFt4648ZJKGLmualxU9Uu1FiGae5LpJUIZeRKA68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}