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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc951b4881041e65584db3ad930f0407110f0f173966074c1c1a83a07490d1d6' 
  AND token = 'eX/RXq/Kj9V27Ptr+d1Dn4zqiTYHoG0wfdsUL6muBEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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