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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa8637549c2a155f492f64933d532e862b73a4d20c5a1a5f4436879aa0e077c' 
  AND token = 'UjcIgBCguJZ1TOI2CuCZM9O01IfgYu7CDRJZ9LcywKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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