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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702d5b48c6a49f83df7ece89883965001cdaa265ef2cb653e17ba31b47f9dc83' 
  AND token = 'Ud5Pni0uyzZsGOMa3fS7nDXp9VGtiFAzOffq84rgvhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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