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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a3d8e7b36c0a4791a362ec5712b19419ffad2b1b05d0ccc5786212e0dbb2fa' 
  AND token = 'WT5dK3q5jgT5fH+FmgcC65o72nyNDniVpqPEVrs6Tjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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