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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb24f3a29b6b00384a67111055dc8271f8a7d632e408c66ca8ce530ae66e6f2' 
  AND token = 'DdiRMp9TBxegXHuG25Zq9FKNJAecPNHI0gopzuMxLgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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