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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d93463110e901b62bda5ee6b4db849b06680d26575f1ab6cb5652ec14a42714' 
  AND token = 'LO34gn+luNo75sy6l9vbtPBocQkO7a1C4JTNSFCZcpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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