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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfeee179f0b94b88a11752929048f56b8c45beb81026bec45ac3f8790f0da815' 
  AND token = 'cLoBEvydsZnWDMiN/r9eUgvl5UIgQUmv1iYxEI7aubE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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