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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f731b295ee9c9032f8110e2aae712db009d6b18c06c68a8b2cd8828b44af7e8' 
  AND token = 'yNAOymb85pZ/04dE1wpoH3rNdwzKI5nBJyavAZnP0F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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