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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98176c60c94c72df781bfe2c2c3318487a3b2fe08a92b1cfcffe6df42289b853' 
  AND token = 'IeQ8Rotbr2YEolgFRXq5JN1VIr/qDb8MAzkuLdg5R8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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