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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25011c9a1252efe3a3438b6a23716049ec4affd923d252c5a222b56cbe9f0359' 
  AND token = 'YsqwQqbMComMytFNGREMHa9Ggj1AMalflmuMZ2e/224=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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