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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec465bb2ccf711193737f11ac58e93e0c98f3f091a2ba7139f796f59cd63a62' 
  AND token = '48b0rAyjni6kE1DDPEJM20oelRJ+XTEg8bmZdFdeLE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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