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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195350e9b3c3b3d75c580a12f69856f742056af798644925314b4efd5bdab75b' 
  AND token = 'fa5okoz7j08rp+v8/2PaODsydru36TV7D3QFr4DyVMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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