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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f48aee57e5afd19c36cad16d768b92d05b80aeb8b43fd33151adf23d2e599f' 
  AND token = 'JHunDojiTPUudy3vPDXCQBZhqHrdZ1W+XXakJDCloJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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