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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccfd91ee4f25e776ca51ab3aa5c09a8999d7750bc98415f18bbab334c26406b6' 
  AND token = 'MZtOxY/GWw8sp6SQcD1T5nabbo2LSbO19GwmQwvpnwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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