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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b3ff01b32b8a4dcedd7be7b7ca81f40c380741e7eea9f7e3dfa2f870008663' 
  AND token = 'HnnyHrGwDUxB6QVfEeghaqJc6/5w72bXqGaw1maNyns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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