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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c3b63d3eee4033692f73d3522f1fba5d5e87c15aed535b783db30001224e7d' 
  AND token = 'wxsPQEHzhiUbCnjBIq14bPRyWDgLWzZaxwD/l8WUR5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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