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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eb3c303fa0a93e8dabb259701635f9b92e2d1bca067a5a83ac9e7bcf86eb9b' 
  AND token = 'UHg1Z1H3VYcrdm1jZu6hITTcV030W49s8Tgzvb4fnGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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