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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fce62b35f7a1b1a7d83595576ef4ef674956e481e66fe264dd71a794e9ad725' 
  AND token = 'wHZS7S64hui+slUi5xC4Lei88/Fw8y5u7mBIiC91ic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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