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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035634c9240534954cdcf5edc880ca10d3db6e824a043209988ca571e20c2536' 
  AND token = 'nvujX9/PY/5itMNN7jhnWPFjWxNEE8et0/5e0fzWhC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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