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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c5e69970e7169096046d315c8ecce68e50556b832c4140752c127e17ba3e63' 
  AND token = '11IQgC+Ep/HD+FPjVi0DoIufyki+Xlsssat9vdOPciA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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