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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce6f5eb71dff7296850dabff2666c0c5f72933e99f6d57017dd8a1470fd9dc1' 
  AND token = 'vCsT71z8SBiFVrEaT7/IQ5X6OB3xG7KxYayN9+FXIS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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