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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5921714ca7a1ca3e9b2591a1f3d96fc37aea49096ff64014d1e41dd5140c6cb' 
  AND token = 'N8AehFST07OfGCnKZzQS4RN+dMwieUi/P/zVZ6zmQ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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