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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4292182a2961b2939c504067ed6d13cff83be9a44513ef5a6eeea2f9360a3431' 
  AND token = '/rexo4WOfRyuRwlOD451KAH83qN24HI8noa3einQ358=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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