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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35245db08b4a031e60637686a32467bfb70b4fcb7488610e1f5bf23bb5ecfa97' 
  AND token = 'g/MNGBOrtp8wr2+GvniDqaVvxx9mFtTCniqwcC7tad0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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