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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2b6f7f5af0ffe04345ef5f6077a336cdda3126721896aa2822d204ad12b6e4' 
  AND token = 'pwImCud7+/84qxBi8ieeE2cEAnyQHfG+/y9kbDl62Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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