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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ee4b09400624b2f733f9fe129894a5e409487705848db93610e6262a72b723' 
  AND token = 'worqnVbdLo8CiVTCSJoeKaF/RuP2KVzsqq+tNludO20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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