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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70dd69a85601660264968e6a89ae1d4cc248c746fd60e7a608802a633056772' 
  AND token = 'IvuGVmNpLii7AfTumYfbVpHwXen7s71WgTA/fmQ5jSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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