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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaea18df31d362f40174edb165bda4ced102c7e4f548cdf43612306701a541e1' 
  AND token = 'PsoTPQshe+ee81saNKU8/eQLvh1GSQBtnUK6DEwkjIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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