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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570a60506109568bd09ed01ca0a4ccd6b303dcd2910991688c3e1abb2a0002e5' 
  AND token = 'J8RF9rTrhcKqm08hJ9qw2mLjEhO3SsL1+DD2PP1gKRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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