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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba946e99c70ba5abca1ffb4680b417362ba6f92c66950e4554f81a26cc970de' 
  AND token = 'WzhXGm3/jFYZA4TW7QV+Cr1eX5/+FhpAMfyQhU34Rs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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