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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd15bf65e8abbd18db675eece59c1bb6c618d8df04addbed92ad0d0dd4634fc' 
  AND token = 'r5OOT9jaS4R/vAqn/KDFlaGYEtT80oREnxaTAveRPe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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