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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8852b576e08f3d131af9f6bb231beb60325f969618bee5b4538e65ab6dbd2e20' 
  AND token = 'HBcm3hG6dAbwHfNnJaeLuvdfdb883Bzx+R55/XhU5mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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