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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b6be35fa958c334f1e69b25e5a456225a768a1656540a6782bd18b1888241e' 
  AND token = 'AZPCZcsZ9EMA7bwd669zVb7vQo0fB9VasFCjmJm/Erw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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