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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc862112bfe7d5820ad577a6e59358267139b0ec517a02e7030fdda7ce6bb621' 
  AND token = 'VjaaG9b3Kek+8qO5cKnY7Y+pzSM+FwBDICpM6FTqCE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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