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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327ce8f66da2216707a37a632d11e8d079ecc98d92c177f9c389770463743ea5' 
  AND token = '/xe3T+SM1qJaWZYDizK4G0NKpsxLFFjJOaE4M+QRkDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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