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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33cd91947c68a03d53bb9e0f2df3d8ef9d09b58f1bef60be6f902fecee7504e' 
  AND token = 'xti5twqLl1e8zb7IOOpaNVu/bn8aNJbcS1rkSlsEQFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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