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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386d35684b855eae96a4cdbf82d148d0229d923da4190bf9f1447eab0ae1b132' 
  AND token = 'NqXt9fS5ly5cC968rjxoDwIzT4LThs2sJDDRoseOTkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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