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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8545f6ad456990b11cf332996ab4355d0b26eb8ce750f3de16d8f1890bb08f86' 
  AND token = 'PZJqgqoQv0fwtawl3vJIWe6XkvjgfV1drcceoJhaYiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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