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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f24a2a39df796f9e3b9a3f175b3d66267a5b2b90026be4f7dd8ec906e81bce4' 
  AND token = 'i4FDm/Zykdiun5JRvr2tM7gTYfYABnymQN9yKRNZ+ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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