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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04d31e090488fa16b810a673defbc30ac0ef270cc561d8723b6a3f9dc576225' 
  AND token = '8BY3m7I9Z80/G+gyZ6aRoiPqGL4Q7gnGMmy92J0eE2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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