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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c81d9fe5615f51034920c537e9dca711419576e1b18c98a7d5ef45674365ce' 
  AND token = 'cuKXo2E3Ors/mQco6Oid52VJM8wMqALRU4A9qvQjBQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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