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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27b8746695b7da5ce13298e94efe1d5607ee11af826fb21df9b18b4366959f8' 
  AND token = 'fOwsCygzTru+CdCQgXhKMAPAMFO5IAs1WDe+Yc5lxtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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