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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e60120b92399ff61f19a8604460902a004ecdfb45dff20336bc8349d1653500' 
  AND token = 'ejYN2qERg1MjZniK1keNFcetkFoYOMCZpf0xrVZDlDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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