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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09db74f022577303203a6d2f2a9e16b8eae35fb4de160b96e14c9e5ae45c6e8e' 
  AND token = 'ZIMM6liNlkNHpSgkloV1l3zy3fDPZ89HLjlxj7lUgx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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