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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8177cc33e1a77e17ea41cabdf7608e36e9c38d91b4c7d4fcf0df1f8408ae119' 
  AND token = '7WxNiSpt32aDLn2idhvwvou/JVsvTn3GFe6VpnJXhgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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