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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be34ad6df0945a49e4b9d23955e92807ae475c5f4f71eb3ef3d9713bc8261744' 
  AND token = '9SrW1ySnqCLaiA0T33gyLhfTWQpmAU+RfoZ2NxK++L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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