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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad2d892afb727f9f3b01793684d0e03d2173f7e05ec8ee9f8b462f7d848247f' 
  AND token = 'MP9nwUbgoJbVUkiNEdClyLjKM5Nv5/X6XD0CqN1nU1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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