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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e99a97dbdfb0b4891ac1abc60e47f7dc530c9cd026281a9aa014208d7a915d' 
  AND token = '53kN14vP5QiFOt+HeI3L4/CUgw0NAphX65NicHOM70E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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