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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8899e9c9a1ff09744e41923c42ba015245cff37898968cc49d9e1b82d8029c' 
  AND token = 'nIdo7+lFoIW3Rhxeyc0Hpn4ulBnHp7NRo0FEuVbUadA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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