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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9801fc3de5a53302e27c767d15eee68fffb292ffee92a6a9bf1c33864a0b3a16' 
  AND token = '+aR7D92CS+YkrBE0eoEM6YyfEEVch/p8KFxLG4LiZ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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