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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d464b1863265180a158a919510e8042cdc53dc0b088d70ab9b3766d25a1752' 
  AND token = '6fb5D2wfBDq/+YOrCMASlGuA5TnDqexl47wZ1Lh5pL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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